1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Tom Gundersen <teg@jklm.no>
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include "network-internal.h"
26 #include "path-util.h"
27 #include "conf-files.h"
28 #include "conf-parser.h"
30 #include "siphash24.h"
32 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
33 [NETDEV_KIND_BRIDGE] = "bridge",
34 [NETDEV_KIND_BOND] = "bond",
35 [NETDEV_KIND_VLAN] = "vlan",
36 [NETDEV_KIND_MACVLAN] = "macvlan",
37 [NETDEV_KIND_VXLAN] = "vxlan",
38 [NETDEV_KIND_IPIP] = "ipip",
39 [NETDEV_KIND_GRE] = "gre",
40 [NETDEV_KIND_SIT] = "sit",
41 [NETDEV_KIND_VETH] = "veth",
42 [NETDEV_KIND_VTI] = "vti",
43 [NETDEV_KIND_DUMMY] = "dummy",
44 [NETDEV_KIND_TUN] = "tun",
45 [NETDEV_KIND_TAP] = "tap",
48 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
49 DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
51 static void netdev_cancel_callbacks(NetDev *netdev) {
52 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
53 netdev_enslave_callback *callback;
58 rtnl_message_new_synthetic_error(-ENODEV, 0, &m);
60 while ((callback = netdev->callbacks)) {
62 assert(callback->link);
63 assert(callback->callback);
64 assert(netdev->manager);
65 assert(netdev->manager->rtnl);
67 callback->callback(netdev->manager->rtnl, m, link);
70 LIST_REMOVE(callbacks, netdev->callbacks, callback);
75 static void netdev_free(NetDev *netdev) {
79 netdev_cancel_callbacks(netdev);
82 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
84 free(netdev->filename);
86 free(netdev->description);
88 free(netdev->ifname_peer);
90 free(netdev->mac_peer);
91 free(netdev->user_name);
92 free(netdev->group_name);
94 condition_free_list(netdev->match_host);
95 condition_free_list(netdev->match_virt);
96 condition_free_list(netdev->match_kernel);
97 condition_free_list(netdev->match_arch);
102 NetDev *netdev_unref(NetDev *netdev) {
103 if (netdev && (-- netdev->n_ref <= 0))
109 NetDev *netdev_ref(NetDev *netdev) {
111 assert_se(++ netdev->n_ref >= 2);
116 void netdev_drop(NetDev *netdev) {
117 if (!netdev || netdev->state == NETDEV_STATE_LINGER)
120 netdev->state = NETDEV_STATE_LINGER;
122 log_debug_netdev(netdev, "netdev removed");
124 netdev_cancel_callbacks(netdev);
126 netdev_unref(netdev);
131 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
138 netdev = hashmap_get(manager->netdevs, name);
149 static int netdev_enter_failed(NetDev *netdev) {
150 netdev->state = NETDEV_STATE_FAILED;
155 static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_rtnl_message_handler_t callback) {
156 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
160 assert(netdev->state == NETDEV_STATE_READY);
161 assert(netdev->manager);
162 assert(netdev->manager->rtnl);
166 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req,
167 RTM_SETLINK, link->ifindex);
169 log_error_netdev(netdev,
170 "Could not allocate RTM_SETLINK message: %s",
175 r = sd_rtnl_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
177 log_error_netdev(netdev,
178 "Could not append IFLA_MASTER attribute: %s",
183 r = sd_rtnl_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
185 log_error_netdev(netdev,
186 "Could not send rtnetlink message: %s",
193 log_debug_netdev(netdev, "enslaving link '%s'", link->ifname);
198 static int netdev_enter_ready(NetDev *netdev) {
199 netdev_enslave_callback *callback, *callback_next;
203 assert(netdev->ifname);
205 if (netdev->state != NETDEV_STATE_CREATING)
208 netdev->state = NETDEV_STATE_READY;
210 log_info_netdev(netdev, "netdev ready");
212 LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
213 /* enslave the links that were attempted to be enslaved before the
215 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
219 LIST_REMOVE(callbacks, netdev->callbacks, callback);
220 link_unref(callback->link);
227 /* callback for netdev's created without a backing Link */
228 static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
229 _cleanup_netdev_unref_ NetDev *netdev = userdata;
232 assert(netdev->state != _NETDEV_STATE_INVALID);
234 r = sd_rtnl_message_get_errno(m);
236 log_debug_netdev(netdev, "netdev exists, using existing");
238 log_warning_netdev(netdev, "netdev could not be created: %s", strerror(-r));
247 int config_parse_tunnel_address(const char *unit,
248 const char *filename,
251 unsigned section_line,
258 unsigned char family = AF_INET;
266 r = net_parse_inaddr(rvalue, &family, n);
268 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
269 "Tunnel address is invalid, ignoring assignment: %s", rvalue);
275 static int netdev_create(NetDev *netdev) {
276 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
281 assert(netdev->ifname);
282 assert(netdev->manager);
283 assert(netdev->manager->rtnl);
285 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_NEWLINK, 0);
287 log_error_netdev(netdev,
288 "Could not allocate RTM_NEWLINK message: %s",
293 r = sd_rtnl_message_append_string(req, IFLA_IFNAME, netdev->ifname);
295 log_error_netdev(netdev,
296 "Could not append IFLA_IFNAME attribute: %s",
302 r = sd_rtnl_message_append_u32(req, IFLA_MTU, netdev->mtu);
304 log_error_netdev(netdev,
305 "Could not append IFLA_MTU attribute: %s",
312 r = sd_rtnl_message_append_ether_addr(req, IFLA_ADDRESS, netdev->mac);
314 log_error_netdev(netdev,
315 "Colud not append IFLA_ADDRESS attribute: %s",
321 r = sd_rtnl_message_open_container(req, IFLA_LINKINFO);
323 log_error_netdev(netdev,
324 "Could not open IFLA_LINKINFO container: %s",
329 kind = netdev_kind_to_string(netdev->kind);
331 log_error_netdev(netdev, "Invalid kind");
335 r = sd_rtnl_message_open_container_union(req, IFLA_INFO_DATA, kind);
337 log_error_netdev(netdev,
338 "Could not open IFLA_INFO_DATA container: %s",
343 r = sd_rtnl_message_close_container(req);
345 log_error_netdev(netdev,
346 "Could not close IFLA_INFO_DATA container %s",
351 r = sd_rtnl_message_close_container(req);
353 log_error_netdev(netdev,
354 "Could not close IFLA_LINKINFO container %s",
359 r = sd_rtnl_call_async(netdev->manager->rtnl, req, &netdev_create_handler, netdev, 0, NULL);
361 log_error_netdev(netdev,
362 "Could not send rtnetlink message: %s", strerror(-r));
368 log_debug_netdev(netdev, "creating netdev");
370 netdev->state = NETDEV_STATE_CREATING;
375 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
376 int netdev_enslave(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
379 switch(netdev->kind) {
380 case NETDEV_KIND_VLAN:
381 return netdev_create_vlan(netdev, link, callback);
382 case NETDEV_KIND_MACVLAN:
383 return netdev_create_macvlan(netdev, link, callback);
384 case NETDEV_KIND_VXLAN:
385 return netdev_create_vxlan(netdev, link, callback);
386 case NETDEV_KIND_IPIP:
387 case NETDEV_KIND_GRE:
388 case NETDEV_KIND_SIT:
389 case NETDEV_KIND_VTI:
390 return netdev_create_tunnel(netdev, link, callback);
395 if (netdev->state == NETDEV_STATE_READY) {
396 r = netdev_enslave_ready(netdev, link, callback);
400 /* the netdev is not yet read, save this request for when it is*/
401 netdev_enslave_callback *cb;
403 cb = new0(netdev_enslave_callback, 1);
407 cb->callback = callback;
411 LIST_PREPEND(callbacks, netdev->callbacks, cb);
417 int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {
427 r = sd_rtnl_message_get_type(message, &type);
429 log_error_netdev(netdev, "Could not get rtnl message type");
433 if (type != RTM_NEWLINK) {
434 log_error_netdev(netdev, "Can not set ifindex from unexpected rtnl message type");
438 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
440 log_error_netdev(netdev, "Could not get ifindex: %s", strerror(-r));
441 netdev_enter_failed(netdev);
443 } else if (ifindex <= 0) {
444 log_error_netdev(netdev, "Got invalid ifindex: %d", ifindex);
445 netdev_enter_failed(netdev);
449 if (netdev->ifindex > 0) {
450 if (netdev->ifindex != ifindex) {
451 log_error_netdev(netdev, "Could not set ifindex to %d, already set to %d",
452 ifindex, netdev->ifindex);
453 netdev_enter_failed(netdev);
456 /* ifindex already set to the same for this netdev */
460 r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &received_name);
462 log_error_netdev(netdev, "Could not get IFNAME");
466 if (!streq(netdev->ifname, received_name)) {
467 log_error_netdev(netdev, "Received newlink with wrong IFNAME %s",
469 netdev_enter_failed(netdev);
473 r = sd_rtnl_message_enter_container(message, IFLA_LINKINFO);
475 log_error_netdev(netdev, "Could not get LINKINFO");
479 r = sd_rtnl_message_read_string(message, IFLA_INFO_KIND, &received_kind);
481 log_error_netdev(netdev, "Could not get KIND");
485 r = sd_rtnl_message_exit_container(message);
487 log_error_netdev(netdev, "Could not exit container");
491 if (netdev->kind == NETDEV_KIND_TAP)
492 /* the kernel does not distinguish between tun and tap */
495 kind = netdev_kind_to_string(netdev->kind);
497 log_error_netdev(netdev, "Could not get kind");
498 netdev_enter_failed(netdev);
503 if (!streq(kind, received_kind)) {
504 log_error_netdev(netdev,
505 "Received newlink with wrong KIND %s, "
506 "expected %s", received_kind, kind);
507 netdev_enter_failed(netdev);
511 netdev->ifindex = ifindex;
513 log_debug_netdev(netdev, "netdev has index %d", netdev->ifindex);
515 netdev_enter_ready(netdev);
520 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
522 static int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
523 _cleanup_free_ struct ether_addr *mac = NULL;
532 mac = new0(struct ether_addr, 1);
537 sz = sizeof(sd_id128_t) + l;
540 /* fetch some persistent data unique to the machine */
541 r = sd_id128_get_machine((sd_id128_t*) v);
545 /* combine with some data unique (on this machine) to this
547 memcpy(v + sizeof(sd_id128_t), ifname, l);
549 /* Let's hash the host machine ID plus the container name. We
550 * use a fixed, but originally randomly created hash key here. */
551 siphash24(result, v, sz, HASH_KEY.bytes);
553 assert_cc(ETH_ALEN <= sizeof(result));
554 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
556 /* see eth_random_addr in the kernel */
557 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
558 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
566 static int netdev_load_one(Manager *manager, const char *filename) {
567 _cleanup_netdev_unref_ NetDev *netdev = NULL;
568 _cleanup_fclose_ FILE *file = NULL;
574 if (null_or_empty_path(filename)) {
575 log_debug("skipping empty file: %s", filename);
579 file = fopen(filename, "re");
587 netdev = new0(NetDev, 1);
592 netdev->manager = manager;
593 netdev->state = _NETDEV_STATE_INVALID;
594 netdev->kind = _NETDEV_KIND_INVALID;
595 netdev->macvlan_mode = _NETDEV_MACVLAN_MODE_INVALID;
596 netdev->vlanid = VLANID_MAX + 1;
597 netdev->vxlanid = VXLAN_VID_MAX + 1;
598 netdev->tunnel_pmtudisc = true;
599 netdev->learning = true;
601 r = config_parse(NULL, filename, file,
602 "Match\0NetDev\0VLAN\0MACVLAN\0VXLAN\0Tunnel\0Peer\0Tun\0Tap\0",
603 config_item_perf_lookup, (void*) network_netdev_gperf_lookup,
604 false, false, netdev);
606 log_warning("Could not parse config file %s: %s", filename, strerror(-r));
610 if (netdev->kind == _NETDEV_KIND_INVALID) {
611 log_warning("NetDev without Kind configured in %s. Ignoring", filename);
615 if (!netdev->ifname) {
616 log_warning("NetDev without Name configured in %s. Ignoring", filename);
620 if (netdev->kind == NETDEV_KIND_VLAN && netdev->vlanid > VLANID_MAX) {
621 log_warning("VLAN without valid Id configured in %s. Ignoring", filename);
625 if (netdev->kind == NETDEV_KIND_VXLAN && netdev->vxlanid > VXLAN_VID_MAX) {
626 log_warning("VXLAN without valid Id configured in %s. Ignoring", filename);
630 if (netdev->kind != NETDEV_KIND_VLAN && netdev->vlanid <= VLANID_MAX) {
631 log_warning("VLAN Id configured for a %s in %s. Ignoring",
632 netdev_kind_to_string(netdev->kind), filename);
636 if (netdev->kind != NETDEV_KIND_VXLAN && netdev->vxlanid <= VXLAN_VID_MAX) {
637 log_warning("VXLAN Id configured for a %s in %s. Ignoring",
638 netdev_kind_to_string(netdev->kind), filename);
642 if (netdev->kind != NETDEV_KIND_MACVLAN &&
643 netdev->macvlan_mode != _NETDEV_MACVLAN_MODE_INVALID) {
644 log_warning("MACVLAN Mode configured for a %s in %s. Ignoring",
645 netdev_kind_to_string(netdev->kind), filename);
649 netdev->filename = strdup(filename);
650 if (!netdev->filename)
653 if (net_match_config(NULL, NULL, NULL, NULL, NULL,
654 netdev->match_host, netdev->match_virt,
655 netdev->match_kernel, netdev->match_arch,
656 NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
660 r = netdev_get_mac(netdev->ifname, &netdev->mac);
662 log_error("Failed to generate predictable MAC address for %s",
668 r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
672 LIST_HEAD_INIT(netdev->callbacks);
674 switch (netdev->kind) {
675 case NETDEV_KIND_VETH:
676 if (!netdev->ifname_peer) {
677 log_warning("Veth NetDev without peer name configured "
678 "in %s. Ignoring", filename);
683 r = netdev_get_mac(netdev->ifname_peer, &netdev->mac_peer);
685 log_error("Failed to generate predictable MAC address for %s",
686 netdev->ifname_peer);
691 r = netdev_create_veth(netdev, netdev_create_handler);
696 case NETDEV_KIND_DUMMY:
697 r = netdev_create_dummy(netdev, netdev_create_handler);
702 case NETDEV_KIND_BRIDGE:
703 case NETDEV_KIND_BOND:
704 r = netdev_create(netdev);
709 case NETDEV_KIND_TUN:
710 case NETDEV_KIND_TAP:
711 r = netdev_create_tuntap(netdev);
720 log_debug_netdev(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
727 int netdev_load(Manager *manager) {
734 while ((netdev = hashmap_first(manager->netdevs)))
735 netdev_unref(netdev);
737 r = conf_files_list_strv(&files, ".netdev", NULL, network_dirs);
739 log_error("Failed to enumerate netdev files: %s", strerror(-r));
743 STRV_FOREACH_BACKWARDS(f, files) {
744 r = netdev_load_one(manager, *f);